What is the unit of refractive index?

metre/second

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metre

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no unit

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Dioptre

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Solution

The correct option is C
no unit

Refractive index(n) $= \frac{Speed of light in vacuum}{Speed of light in the medium}$

Since the refractive index is a ratio of two similar quantities(speed of light), it has no unit.

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Similar questions

Which of the following unit is not a fundamental unit :

(a) metre (b) litre

a

b

c

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